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首页> 外文期刊>Australian Journal of Crop Science >Effect of nitrogen source and oxygen deficiency on carbon metabolism and antioxidant system of rubber tree plants (Hevea spp.)
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Effect of nitrogen source and oxygen deficiency on carbon metabolism and antioxidant system of rubber tree plants (Hevea spp.)

机译：氮源和缺氧对橡胶树植物碳代谢和抗氧化系统的影响

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Oxygen deficiency in roots affects key functions such as nutrient and water uptake; furthermore, liquid-CO2 assimilation, stomatal conductance/ transpiration and carbohydrate translocation are also affected. Under oxygen depletion, there is also an uncontrolled increase of free radicals in cells. The nitrogen application has been observed to increase the plant tolerance to oxygen deficiency. Indeed, NO3? and NH4+ (nitrogen forms) may induce distinct metabolic responses under hypoxia. Nevertheless, the beneficial effects of N during hypoxia it is not fully explained. In this study, the nitrogen (N) role in the physiology and metabolism of rubber plants (Hevea brasiliensis) subjected to oxygen deficiency was evaluated. The experiment was conducted with plants supplied with KNO3 (8 mM N) or (NH4)2SO4 (8 mM N) in nutrient solution for 3 days. The experiments were arranged in a completely randomized design (CRD) in a factorial arrangement (2x2x4). The experiment had four treatments and four time points (12, 24, 48 and 72 hours) for stress measurements with four replicates, totaling 64 plants. Data were analyzed using analysis of variance (ANOVA), and the means were compared using the Scott-Knott test (p ≤ 0.05). Gas exchange measurements and biochemical analyzes were performed at 12, 24, 48 and 72 hours after treatment induction. The results showed that, net photosynthesis, stomatal conductance and transpiration rate in stressed plants decreased significantly when compared to the control plants, regardless of nitrogen source. However, under hypoxia, plants treated with NO3- showed significantly higher CO2 assimilation, overcoming the treatment with NH4+. Therefore, when comparing plants treated with NO3- and those treated with NH4+ under flooding conditions (for 3 days), the first presented higher sucrose production, consequently higher invertase isoform activity. Under hypoxia, NO3- treated plants also showed higher antioxidant system efficiency. Therefore, H2O2 content was higher in plants treated with NH4+. Thus, we concluded that carbon metabolism such as carbohydrate anabolism, catabolism and transport were negatively affected by hypoxia. However, NO3- addition in contrast to NH4+ treatment reduced damage caused by oxygen deficiency increasing the level of tolerance of the plant to stress.
机译：根部缺氧会影响关键功能，例如营养和水分吸收;此外，液体-CO2同化，气孔导度/蒸腾作用和碳水化合物转运也受到影响。在氧耗竭下，细胞中的自由基也不受控制地增加。已经观察到施氮增加了植物对缺氧的耐受性。确实，NO3？在低氧条件下，NH4 +（氮的形式）可能诱导不同的代谢反应。然而，N在缺氧期间的有益作用尚未完全阐明。在这项研究中，评估了氮（N）在遭受缺氧的橡胶植物（巴西橡胶树）的生理和代谢中的作用。实验在营养液中的植物中加入了KNO3（8 mM N）或（NH4）2SO4（8 mM N）。实验以因子安排（2x2x4）的完全随机设计（CRD）进行安排。该实验有四个处理和四个时间点（12、24、48和72小时）用于压力测量，一式四份，总共64株。使用方差分析（ANOVA）分析数据，并使用Scott-Knott检验比较均值（p≤0.05）。在诱导处理后的12、24、48和72小时进行气体交换测量和生化分析。结果表明，与对照植物相比，无论氮源如何，胁迫植物的净光合作用，气孔导度和蒸腾速率均显着下降。但是，在缺氧条件下，用NO3处理的植物表现出明显更高的CO2同化能力，克服了用NH4 +处理的问题。因此，在充水条件下（连续3天）比较用NO3-处理的植物和用NH4 +处理的植物时，第一个显示出较高的蔗糖产量，因此具有较高的转化酶同工型活性。在缺氧条件下，NO3处理过的植物也表现出更高的抗氧化系统效率。因此，用NH4 +处理过的植物中H2O2含量较高。因此，我们得出的结论是，碳代谢如碳水化合物的合成代谢，分解代谢和运输受到缺氧的负面影响。但是，与NH4 +处理相比，NO3-的添加减少了由缺氧引起的损害，从而提高了植物对胁迫的耐受性。

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